There is no official, developer-sanctioned free download available. During its active life (roughly 2015-2019), the game participated in several "Pay What You Want" charity bundles (such as Queer Games Bundle or itch.io’s Bundle for Racial Justice and Equality). If you purchased one of those bundles, you legally own a copy.
The risks (malware, broken gameplay) outweigh the reward. Instead: Break Chance Memento Free Download